pause and interactive input during xsl transformation

Hi all,

I need to run an XSL transformation that depends on input provided by 
the user at run-time.

Sometimes, the transformation has to be paused for some time in order to 
allow something out of the system to happen.

For this purpose I created:
  1. a function myext:input-prompt($text), where text is a string to be 
printed on the output console, and the function returns the line typed 
by the user
  2. an element <myext:pause time="$hours" />, where hours is a float 
that specifies how long to pause the transformation


I wonder if someone uses such things in his XSL transformations and 
whether there is some extension library that provides them.

TIA,
Adrian.